IP Library › Granted Patent US 4,808,732
Granted Patent Utility
US 4,808,732 · App. 07/115,544

Amino-tetraalkylbenzoylphthalic acids

Inventor: Josef Pfeifer
Patented Case View Patent ↗
Granted: Feb 28, 1989 Filed: Oct 28, 1987
Inventor
Josef Pfeifer
Assignee (at issue)
Ciba-Geigy

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,808,732
App. No.
07/115,544
Filed
1987-10-28
Granted
1989-02-28
Kind
A